Vulnerability Details CVE-2019-1977
A vulnerability within the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an endpoint device in certain circumstances. The vulnerability is due to improper endpoint learning when packets are received on a specific port from outside the ACI fabric and destined to an endpoint located on a border leaf when Disable Remote Endpoint Learning has been enabled. This can result in a Remote (XR) entry being created for the impacted endpoint that will become stale if the endpoint migrates to a different port or leaf switch. This results in traffic not reaching the impacted endpoint until the Remote entry can be relearned by another mechanism.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.009
EPSS Ranking 75.1%
CVSS Severity
CVSS v3 Score 6.8
CVSS v2 Score 4.3
References
Products affected by CVE-2019-1977
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cpe:2.3:h:cisco:nexus_9000:-
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cpe:2.3:h:cisco:nexus_93108tc-ex:-
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cpe:2.3:h:cisco:nexus_93108tc-fx:-
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cpe:2.3:h:cisco:nexus_93120tx:-
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cpe:2.3:h:cisco:nexus_93128tx:-
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cpe:2.3:h:cisco:nexus_93180lc-ex:-
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cpe:2.3:h:cisco:nexus_93180yc-ex:-
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cpe:2.3:h:cisco:nexus_93180yc-fx:-
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cpe:2.3:h:cisco:nexus_9332pq:-
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cpe:2.3:h:cisco:nexus_9336c-fx2:-
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cpe:2.3:h:cisco:nexus_9336pq:-
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cpe:2.3:h:cisco:nexus_9348gc-fxp:-
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cpe:2.3:h:cisco:nexus_9364c:-
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cpe:2.3:h:cisco:nexus_9372px-e:-
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cpe:2.3:h:cisco:nexus_9372px:-
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cpe:2.3:h:cisco:nexus_9372tx-e:-
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cpe:2.3:h:cisco:nexus_9372tx:-
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cpe:2.3:h:cisco:nexus_9396px:-
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cpe:2.3:h:cisco:nexus_9396tx:-
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cpe:2.3:h:cisco:nexus_9504:-
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cpe:2.3:h:cisco:nexus_9508:-
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cpe:2.3:h:cisco:nexus_9516:-
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cpe:2.3:o:cisco:nx-os:12.3(1h)
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cpe:2.3:o:cisco:nx-os:13.1(2m)
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cpe:2.3:o:cisco:nx-os:13.1(2o)
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cpe:2.3:o:cisco:nx-os:13.1(2p)